de
https://forums.funcom.com/t/11-ways-to-communicate-delta-airlines-customer-service-thought-email-and-chat/279142
https://www.sitepoint.com/community/t/05-ways-to-connect-delta-airlines-customer-by-phone-service/477865
https://forums.funcom.com/t/how-to-reach-delta-airlines-customer-service-by-phone/279706
https://forums.funcom.com/t/ways-to-talk-to-delta-airlines-customer-service-now-step-to-step/279738
https://forums.funcom.com/t/ways-to-reach-out-to-delta-airlines-customer-service-by-phone-for-immediate-assistance/279890
https://forums.funcom.com/t/06-ways-to-connect-with-a-delta-airlines-representative-by-phone-for-any-travel-issue/279909